fix: added new base module output for cos resource key details

[toddgiguere]

Description

Added a new output to the base module for retreiving credential details for COS if created.

The new output cos_key_credentials_map is a sensitive output containing all credential outputs of any resource keys created for COS instances.

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[toddgiguere]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 8.4.0 🎉

The release is available on:

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• v8.4.0

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